Half to eleazer kempshall



(MOdeL) N. J. GOODWIN.

ARTIFICIAL DBNTURE.

Patentd June 24, 1890.

' UNITED STATES PATENT OFFICE.

NELSON J. GOODWIN, OF HARTFORD, CONNECTICUT, ASSIGNOR OF ONE- HALF TO ELEAZER KEMPSHALL, SAME PLACE.

ARTIFICIAL DENTU RE.

SPECIFICATION forming part of Letters Patent No. 430,639, dated June 24, 1890.

Application filed April 17, 1890. Serial No 348,336. (Model-l To all whom it may concern:

Be it known that I, NELsoN J. GoonwrN, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Artificial Dentures, of which the following is a specification.

This invention relates to partial dentures for use at the sides and at the back of the To mouth, and has for its object to furnish means for steadily holding the denture in the mouth, whether 011 the lower orupperj aw, in cases where there is no opportunity for anchorage at the rear end of the denture, as

r 5 hereinafter more fully set forth.

In the drawings accompanying and forming a part of this specification, Figure 1 is a top or plan view of a partial lower denture embodying my improvements.- Fig. 2 is a side elevation of the same. Fig. 3 is a section in line a a, Fig. 1. Fig. 4 is a section in line b b, Fig. 1. Fig. 5 is a view of the inside of the denture.

Similar characters designate like views in all the figures.

The denture shown in the drawings is constructed for use on the right-hand side of the mouth on the extreme back part of the 'jaw, where there is no anchorage at the rear end of the denture, and consists of the plateB of suitable material and having fixed thereto the teeth T, of such suitable number as re quired in and for each particular instance, and provided with means for anchorage and with means for resisting swaying movements. The plate B may be made of vulcanized rubber in a well-known manner. It is fitted to rest rearward of the natural teeth or roots f and on and over the gu ms, (which are indicated by 4, Figs. 3 and 4,) with one flange or edge 3 extending down on the inside of the alveolar process and gums and with another edge 5 on the outer side of the gums.

The anchorage means consists in a metallic 4,5 clasp 6, Figs. 1 and 2, firmly engaging the first tooth, as 7, of the adjacent natural teeth 7, 8, and 9, Fig. 1. If this clasp were located at one extreme end of the denture and constituted the entire means for retaining and steadying the plate B, it is evident the opposite end 10 of said plate would be comparatively unrestrained and might sway to and fro, as if it were a lever carried on the tooth 7 as a pivot. To overcome that detrimental action I provide on the plate B, at the forward end thereof, an extension or lever L, constructed to have a bearing on a tooth or teeth, as S or 9, or both, forward the pivot or anchorage tooth 7. In Fig. 2 the seats or bearing-surfaces on the plate for the teeth 8 6c and 9 are shown at 14 and 15, respectively, and in Fig. 3 the lever L is shown bearing against the tooth 8 at the point 14. This construction, in connection with the inner edge 3 at the rearward end of the plate and in connection with the intermediate anchorage, furnishes a substantial restraint against displacement horizontally, as seen in Fig. 1. In order to extend this resistance to the vertical direction also, I make the extension L to pro- 7o ject below the teeth 8 and 9, as shown at 16, Figs. 2 and 3, to bear on the gums 4 below the exposed inner surface of the teeth. This,

in connection with the means for restraining the lateral movement, results practically in 7 5 further steadying the plate as against vertical movement.

While this improvement is shown applied to a lower denture, it is equally well adapted for dentures for the upper jaw.

Having thus described my invention, I claim- The removable partial denture, consisting of the plate provided with artificial teeth and fitted to bear on the jaw back of natural teeth and having at the rear part thereof a flange extending on the inside of the alveolar process, combined, substantially as described, with the anchorage-clasp for anchoring the forward end of the denture to the natural 0 tooth, and with a plate-extension reaching forward of said clasp and constructed to bear on the inner side of a natural tooth or teeth forward of the point of anchorage.

NELSON J. GOODWIN.

Witnesses:

FRANCIS H. RICHARDS, HENRY L. REoKAED. 

